package tech.bmatch.common.util;

public class DistanceUtil {
    private static double rad(double d){
        return d*Math.PI/180.0;
    }
    public static double getDistance(double lon1,double lat1,double lon2, double lat2){
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double a = radLat1-radLat2;
        double b = rad(lon1)-rad(lon2);
        double s = 2*Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2)+
                Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));
        s = s*6371000;
        s = Math.round( s * 10000)/10000;
        return s;
    }

}
